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Originally posted by iyyappan select count(chain_cnt) from dba_tables;

count(CHAIN_CNT)
----------------
12210

That is very amusing query. It tells you absolutely nothing about your row chaining. What it realy tells you is how many tables in your database has been analysed, nothing else! If you wanted to find out how many chained/migrated rows you have in your etire database, you should use:

select SUM(chain_cnt) from dba_tables;

Regarding other three tables that realy have some chained/migrated records, you could rebuild them (ALTER TABLE MOVE) with increased PCTFREE parameter to prevent future row migration. But if you are expiriencing row chaining (not row migration) then your block size is too small, you need larger database block size to eventually avoid this.

Jurij ModicASCII a stupid question, get a stupid ANSI
24 hours in a day .... 24 beer in a case .... coincidence?